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4-7-5 | 2
2-7-5 | 2
1 -7-5 | 5
1 -7- 1 | 7
1 - 1'-1
mcm=2×2×5×7=140
A 140 le sumamos 2
entonces sería 142
El menor numero de tres cifras que cumpla tales condiciones es el 142.